SUB ASSESSMENT COMPREHENSIVE
EVALUATION COMPLETE QUESTIONS AND
VERIFIED SOLUTIONS
●● What is the ozone layer and why is it important to us on Earth?
a. Thin layer of R-22 in the atmosphere that filters UV.
b. Protective shield for Earth from the sun's harmful ultraviolent (UV)
rays in the stratosphere layer that extends about 6 to 30 miles above
earth
c. Thin layer of CFC and HCFC in the atmosphere that filters UV.
d. Protective layer that shields UV in the Troposphere
Answer: b. Protective shield for Earth from the sun's harmful
ultraviolent (UV)
rays in the stratosphere layer that extends about 6 to 30 miles above
earth
●● The atom found in CFC and HCFC refrigerants that destroys ozone
in the
stratosphere is?
a. Fluorine
b. Carbon
c. Hydrogen
,d. Chlorine
Answer: d. Chlorine
●● What is an ozone molecule made of?
a. Refrigerant
b. Ammonia
c. Three oxygen atoms (O3).
d. Oxygen and ammonia.
Answer: Three oxygen atoms (O3).
●● Which refrigerant is a CFC?
a. R-134A
b. R-123
c. R-22
d. R-12
Answer: d. R-12
●● What is the name of the atom that attacks ozone molecules?
a. CFC atoms
b. HCFC atoms
c. Chlorine and bromine atoms emitted into the atmosphere
d. a and b
,Answer: c. Chlorine and bromine atoms emitted into the atmosphere
●● Which refrigerant is a HFC?
a. R-134A
b. R-123
c. R-22
d. R-12
Answer: a. R-134A
●● Describe how one Chlorine atom can destroy 100,000 ozone
molecules.
a. Chlorine releases one of the oxygen atoms and forms two O2 oxygen
molecules, leaving the chlorine molecule free to attack another
ozone molecule and repeat the process.
b. Chlorine locks up the ozone molecule and then and then goes after
another.
c. Chlorine converts the ozone to bromine and then attacks more ozone
molecules.
d. Chlorine can bleach 100,000 ozone molecules before it weakens.
Answer: a. Chlorine releases one of the oxygen atoms and forms two O2
oxygen molecules, leaving the chlorine molecule free to attack another
ozone molecule and repeat the process.
, ●● Which refrigerant contains no chlorine?
a. R-134A
b. R-123
c. R-22
d. R-12
Answer: a. R-134A
●● Name the refrigerant types that belong to CFCs, HCFCs and HFCs
a. CFC R-11, R-12, R-500
b. HCFC R-22, R-123
c. HFC R-134a
d. All of the above are correct
Answer: d. All of the above are correct
●● The rule of thumb for refilling approved cylinders is a maximum of
___ percent
liquid?
a. 60%
b. 79%
c. 80%
d. 90%
Answer: c. 80%
EVALUATION COMPLETE QUESTIONS AND
VERIFIED SOLUTIONS
●● What is the ozone layer and why is it important to us on Earth?
a. Thin layer of R-22 in the atmosphere that filters UV.
b. Protective shield for Earth from the sun's harmful ultraviolent (UV)
rays in the stratosphere layer that extends about 6 to 30 miles above
earth
c. Thin layer of CFC and HCFC in the atmosphere that filters UV.
d. Protective layer that shields UV in the Troposphere
Answer: b. Protective shield for Earth from the sun's harmful
ultraviolent (UV)
rays in the stratosphere layer that extends about 6 to 30 miles above
earth
●● The atom found in CFC and HCFC refrigerants that destroys ozone
in the
stratosphere is?
a. Fluorine
b. Carbon
c. Hydrogen
,d. Chlorine
Answer: d. Chlorine
●● What is an ozone molecule made of?
a. Refrigerant
b. Ammonia
c. Three oxygen atoms (O3).
d. Oxygen and ammonia.
Answer: Three oxygen atoms (O3).
●● Which refrigerant is a CFC?
a. R-134A
b. R-123
c. R-22
d. R-12
Answer: d. R-12
●● What is the name of the atom that attacks ozone molecules?
a. CFC atoms
b. HCFC atoms
c. Chlorine and bromine atoms emitted into the atmosphere
d. a and b
,Answer: c. Chlorine and bromine atoms emitted into the atmosphere
●● Which refrigerant is a HFC?
a. R-134A
b. R-123
c. R-22
d. R-12
Answer: a. R-134A
●● Describe how one Chlorine atom can destroy 100,000 ozone
molecules.
a. Chlorine releases one of the oxygen atoms and forms two O2 oxygen
molecules, leaving the chlorine molecule free to attack another
ozone molecule and repeat the process.
b. Chlorine locks up the ozone molecule and then and then goes after
another.
c. Chlorine converts the ozone to bromine and then attacks more ozone
molecules.
d. Chlorine can bleach 100,000 ozone molecules before it weakens.
Answer: a. Chlorine releases one of the oxygen atoms and forms two O2
oxygen molecules, leaving the chlorine molecule free to attack another
ozone molecule and repeat the process.
, ●● Which refrigerant contains no chlorine?
a. R-134A
b. R-123
c. R-22
d. R-12
Answer: a. R-134A
●● Name the refrigerant types that belong to CFCs, HCFCs and HFCs
a. CFC R-11, R-12, R-500
b. HCFC R-22, R-123
c. HFC R-134a
d. All of the above are correct
Answer: d. All of the above are correct
●● The rule of thumb for refilling approved cylinders is a maximum of
___ percent
liquid?
a. 60%
b. 79%
c. 80%
d. 90%
Answer: c. 80%
